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Finding the Fourth Proportional to 129,637, 178,899.18 and 70,021

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Solution

The fourth proportional to 129,637, 178,899.18 and 70,021 is: 96,629.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,637 : 178,899.18 = 70,021 : x
  2. Step 2: Convert to fraction form
    129,637/178,899.18 = 70,021/x
  3. Step 3: Cross multiply
    129,637x = 178,899.18 × 70,021
  4. Step 4: Simplify right side
    129,637x = 12,526,699,482.78
  5. Step 5: Solve for x
    x = 12,526,699,482.78/129,637
  6. Step 6: Final answer
    x = 96,629.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.